Activity of radioactive sources
Activity $I_0=$
Bq on the reference date $t_0=$
Half life $T_{1/2}=$
sec
min
hour
day
year
(Popular sources:
Sources
60Co
137Cs
22Na
152Eu
56Co
90Sr
)
Activity $I$ on the specified date $t_1=$
is
$I=I_0\times\left(\frac{1}{2}\right)^{(t_1-t_0)/T_{1/2}}=$
Bq
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